CVE-2026-27735Network attack vector

Sensitive-file exposure via out-of-tree path staging

Published Feb 25, 2026 · Updated Feb 25, 2026

Path traversal in Model Context Protocol mcp-server-git before 2026.1.14 allows remote attackers to stage files outside a repository. The git_add tool passes unvalidated files arguments to GitPython's repo.index.add(), which accepts ../ paths resolving beyond the working tree. A user or agent must invoke the tool action, and staged sensitive files are exposed only if a later commit and push sends them to a remote repository.

CVSS severity6.4
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Model Context Protocol mcp-server-git before 2026.1.14 allows remote attackers to stage files outside a repository. The git_add tool passes unvalidated files arguments to GitPython's repo.index.add(), which accepts ../ paths resolving beyond the working tree. A user or agent must invoke the tool action, and staged sensitive files are exposed only if a later commit and push sends them to a remote repository.

The record

CVE
CVE-2026-27735
Published
Feb 25, 2026
Updated
Feb 25, 2026
Vendor
Model Context Protocol
Product
mcp-server-git
Classifications
CWE-22, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2026.1.14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Model Context Protocol · mcp-server-gitversion=< 2026.1.14

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
6.4GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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